If the user hasn't submitted a username or password, the script simply returns the original instance to the login page, but if the information is there, check it against the database.
如果用户并未提交用户名或密码，则脚本会把最初的实例返回给登录页面，但是如果有了这些信息，则通过数据库检查它们。
Message digests can be used to compare a user-provided password with an original password without having to store the original password.
可以使用消息摘要来比较用户所提供的密码和原始密码，而无需存储原始密码。
This interface will match the original SAPOutboundInterface with only one difference: we will add a couple of input parameters, so we can pass the username and password.
此接口会匹配原始的 SAPOutboundInterface，仅有一处不同：我们将添加几个输入参数，以便能够传递用户名和密码。
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